My BKII shoots 290 fps with 350 grain arrows at 60 lbs and 28" it will stack 2 or 3 or 4 blade broadheads . I think it depends on the bow if you have a bow that has a marginal ture and go with lighter faster arrows your groups may get worse or maybe they'll get better if you are changing the spine for the better . Archery is trial and error sometimes what you think will not work does , and sometimes what you think you know will work does not .

We all have different oppinions , if we did'nt the world would be a BORING place